scholarly journals Oscillatory structural forces between charged interfaces in solutions of oppositely charged polyelectrolytes

Soft Matter ◽  
2020 ◽  
Vol 16 (42) ◽  
pp. 9662-9668
Author(s):  
Katarzyna Kubiak ◽  
Plinio Maroni ◽  
Gregor Trefalt ◽  
Michal Borkovec
Keyword(s):  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Silica Particles ◽  
Atomic Force ◽  
Structural Forces ◽  
Oppositely Charged ◽  
Cationic Polyelectrolytes

Forces between negatively charged micron-sized silica particles were measured in aqueous solutions of cationic polyelectrolytes with the atomic force microscope (AFM).

scholarly journals Direct force measurements between silica particles in aqueous solutions of ionic liquids containing 1-butyl-3-methylimidazolium (BMIM)

2015 ◽  
Vol 17 (25) ◽  
pp. 16553-16559 ◽  
Author(s):  
Valentina Valmacco ◽  
Gregor Trefalt ◽  
Plinio Maroni ◽  
Michal Borkovec
Keyword(s):  
Ionic Liquids ◽  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Silica Particles ◽  
Force Measurements ◽  
Probe Technique ◽  
Colloidal Probe ◽  
Atomic Force

Direct force measurements between silica particles were carried out using the colloidal probe technique, which is based on an atomic force microscope (AFM).

Imaging polymers, proteins and dna in aqueous solutions with the atomic force microscope

1989 ◽  
Vol 47 ◽  
pp. 32-33
Author(s):  
S.A.C. Gould ◽  
B. Drake ◽  
C.B. Prater ◽  
A.L. Weisenhorn ◽  
S.M. Lindsay ◽  
...  
Keyword(s):  
Amino Acids ◽  
Dna Sequencing ◽  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Piezoelectric Crystal ◽  
Atomic Force ◽  
Structure Of Molecules ◽  
Optical Lever

The atomic force microscope (AFM) is an instrument that can be used to image many samples of interest in biology and medicine. Images of polymerized amino acids, polyalanine and polyphenylalanine demonstrate the potential of the AFM for revealing the structure of molecules. Images of the protein fibrinogen which agree with TEM images demonstrate that the AFM can provide topographical data on larger molecules. Finally, images of DNA suggest the AFM may soon provide an easier and faster technique for DNA sequencing.The AFM consists of a microfabricated SiO2 triangular shaped cantilever with a diamond tip affixed at the elbow to act as a probe. The sample is mounted on a electronically driven piezoelectric crystal. It is then placed in contact with the tip and scanned. The topography of the surface causes minute deflections in the 100 μm long cantilever which are detected using an optical lever.

Attractive non-DLVO forces induced by adsorption of monovalent organic ions

2018 ◽  
Vol 20 (1) ◽  
pp. 158-164 ◽  
Author(s):  
Alexander M. Smith ◽  
Plinio Maroni ◽  
Michal Borkovec
Keyword(s):  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Colloidal Particles ◽  
Organic Cations ◽  
Force Measurements ◽  
Organic Ions ◽  
Atomic Force

Direct force measurements between negatively charged colloidal particles were carried out using an atomic force microscope (AFM) in aqueous solutions containing monovalent organic cations, namely tetraphenylarsonium (Ph4As+), 1-hexyl-3-methylimidazolium (HMIM+), and 1-octyl-3-methylimidazolium (OMIM+).

scholarly journals Putting a Sphere on an Atomic Force Microscope Cantilever Tip

1997 ◽  
Vol 5 (10) ◽  
pp. 6-6 ◽  
Author(s):  
Stefan Zauscher
Keyword(s):  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Van Der Waals ◽  
Great Precision ◽  
Atomic Force Microscope Cantilever ◽  
Quantitative Measurements ◽  
Atomic Force ◽  
Afm Cantilever ◽  
Repulsive Forces ◽  
Force Microscope Cantilever

Atomic Force Microscopes (AFM) can measure the force between a surface and the tip of a cantilever as a junction of separation with great precision. For example, van der Waals type forces and electrostatic repulsive forces can easily be measured in aqueous solutions using an AFM. The complex, pyramidal shape of the typical AFM cantilever is, however, not well suited for quantitative measurements. It is thus desirable to attach particles of known geometry (usually spheres) to the tip of a cantilever.

scholarly journals Quantitative nanoscale electrostatics of viruses

Nanoscale ◽  
2015 ◽  
Vol 7 (41) ◽  
pp. 17289-17298 ◽  
Author(s):  
M. Hernando-Pérez ◽  
A. X. Cartagena-Rivera ◽  
A. Lošdorfer Božič ◽  
P. J. P. Carrillo ◽  
C. San Martín ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Electrostatic Interactions ◽  
Viral Particle ◽  
Electrostatic Force ◽  
Host Cells ◽  
Atomic Force ◽  
Viral Particles

The recognition events between viruses and host cells are dominated by both specific and non-specific electrostatic interactions determined by the charge of viral particles. Here we probe the charge of individual viruses in aqueous solutions by measuring the electrostatic force between each viral particle and the Atomic Force Microscope tip.

scholarly journals An Investigation of the Adsorption of Xanthate on Bornite in Aqueous Solutions using an Atomic Force Microscope

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 906
Author(s):  
Jinhong Zhang
Keyword(s):  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Force Measurement ◽  
Attenuated Total Reflection ◽  
Solution Ph ◽  
Substrate Adhesion ◽  
Atomic Force ◽  
Measurement Results ◽  
Industry Practice

An atomic force microscope (AFM) was applied to study of the adsorption of xanthate on bornite surfaces in situ in aqueous solutions. AFM images showed that xanthate, i.e., potassium ethyl xanthate (KEX) and potassium amyl xanthate (PAX), adsorbed strongly on bornite, and the adsorbate bound strongly with the mineral surface without being removed by flushing with ethanol alcohol. The AFM images also showed that the adsorption increased with the increased collector concentration and contact time. Xanthate adsorbed on bornite in a similar manner when the solution pH changed to pH 10. The AFM force measurement results showed that the probe–substrate adhesion increased due to the adsorption of xanthate on bornite. The sharp “jump-in” and “jump-off” points on force curve suggest that the adsorbate is not “soft” in nature, ruling out the existence of dixanthogen, an oily substance. Finally, the ATR-FTIR (attenuated total reflection-Fourier-transform infrared) result confirms that the adsorbate on bornite in xanthate solutions is mainly in the form of insoluble cuprous xanthate (CuX) instead of dixanthogen. This xanthate/bornite adsorption mechanism is very similar to what is obtained with the xanthate/chalcocite system, while it is different from the xanthate/chalcopyrite system, for which oily dixanthogen is the main adsorption product on the chalcopyrite surface. The present study helps clarify the flotation mechanism of bornite in industry practice using xanthate as a collector.

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